I've been on here before with this problem which is still ongoing...so hoping there some new faces or experts that can advise?

PROBLEM...
2007 ford focus zetec climate TDCI 1.8 (diesel) bought private(i know mistake)

* When start it from cold I let the glow plug light go out, turn it over with no problems BUT... plumes of white smoke come out of exhaust AND it judders when driving? NOW this only happens until the car warms up then it drives fine no white smoke no juddering? it never looses power turbo kicks in when put foot down and engine management light NEVER come on?
I have had it to numerous garages including the robbers (FORD)!!
Below are the things I have had done to it so you can rule them out...

-FULL BRAND NEW EGR VALVE & MANIFOLD
-4 NEW INJECTORS
-FULL ENGINE SERVICE NEW OIL, OIL FILTER, AIR FILTER, FUEL FILTER,POLLEN FILTER.
-GLOW PLUGS CHECKED. ALL OKAY
-PISTONS PRESSURE CHECKED. ALL OKAY
-WIRING FROM EGR TO ECU. OKAY
-TIMING CHECKED. OKAY

So you can see why its causing me despare
most garages are saying that on diagnostic egr comimg up BUT ive had new one and wiring checked??

SO PLEASE CAN ANYONE HELP OR HAVE ANY IDEAS I'M DESPERATE...
THANKS GUYS